Open AccessSurface-enhanced infrared absorption with Si-doped InAsSb/GaSb nano-antennas
Author(s) -
M. J. Milla,
Franziska Barho,
F. GonzálezPosada,
L. Cerutti,
Benoît Charlot,
M. Bomers,
Frank Neubrech,
E. Tournié,
T. Taliercio
Publication year - 2017
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.026651
Subject(s) - materials science , plasmon , optoelectronics , doping , infrared , absorption (acoustics) , surface plasmon , optics , infrared spectroscopy , surface plasmon resonance , nanotechnology , nanoparticle , chemistry , physics , organic chemistry , composite material
We demonstrate surface enhanced infrared absorption spectroscopy using 1-dimensional highly doped semiconductors based on Si-doped InAsSb plasmonic nano-antennas. Engineering the plasmonic array to support the localized surface plasmon resonance aligned with the molecular vibrational absorption mode of interest involves finely setting the doping level and nano-antenna width. Heavily doped nano-antennas require a wider size compared to lightly doped resonators. Increasing the doping level, and consequently the width of the nano-antenna, enhances the vibrational absorption of a ~15 nm thick organic layer up to 2 orders of magnitude compared to the unstructured sample and therefore improves sensing. These results pave the way towards molecule fingerprint sensor manufacturing by tailoring the plasmonic resonators to get a maximum surface enhanced infrared absorption at the target vibrational mode.
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